is null or empty sql code example

Example 1: sql not null

SELECT column_name FROM table_name 
WHERE column_name IS NOT NULL;

Example 2: t sql null or empty string

select * from vendor
where isnull(vendor_email,'') = ''

Example 3: how to check if a column is null in sql

SELECT column_name FROM table_name 
WHERE column_name IS NULL;

Example 4: sql if empty then

SELECT COALESCE(NULLIF(SomeColumn,''), ReplacementColumn)
FROM SomeTable

Example 5: sql check for null and empty string

IF ISNULL(@param) OR @param = '' THEN doSomething...